Fn.cidr should return a List. Currently returns a String in Java

[rgd11]

Am expecting the following code:

CfnParameter pVpcCidr;

CfnSubnet subnet = new CfnSubnet(this, "MySubnet",
  CfnSubnetProps.builder()
  ...  
  .withCidrBlock(Fn.select(4, Fn.cidr(pVpcCidr.getRef(), 16, "8"))
  .build();

to evalute to:

CidrBlock: !Select [ 4, !Cidr [ !Ref pVpcCidr, 16, 8 ]]

However, this fails to compile since Fn.select expects a list and Fn.cidr returns a string

[eladb]

Fn.cidr should return a list and not a string. In the meantime, you could work around by wrapping it in a token:

Fn.select(4, new Token(() => Fn.cidr(pVpcCidr.getRef(), 16, '8')).toList());

EDIT: use a lazy token

[rgd11]

Tried:

Fn.select(4, new Token(Fn.cidr(this.pVpcCidr.getRef(), 16, "8")).toList())

and received:

[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.6.0:java (default-cli) on project xxxxxx: An exception occured while executing the Java class. Got a literal Token value; only intrinsics can ever evaluate to lists.

[eladb]

Sorry, you will need to use a lazy token: Fn.select(4, new Token(() => Fn.cidr(pVpcCidr.getRef(), 16, '8')).toList());